The demand for apples in the u. s. is qus = 800 - 20p, and foreign demand for apples is qf = 1200 - 40p, where quantity demanded is measured in millions of bushels and price is in dollars per bushel. the world demand for apples is therefore1. q = 400 - 20p when p is $20 or less.2. q = 2000 - 60p when p is $30 or less.3. q = 2000 - 220p when p is $30 or less.4. q = 400 + 20p for all prices..the world supply of apples is qs = 200 + 30p. therefore, the world equilibrium price for apples is $ per bushel and the equilibrium quantity of apples is million bushels. at the equilibrium price, million bushels will be sold in the u. s., and million bushels will be sold in foreign markets